one of my four wheeling friends has a 98 TJ 4-banger w/ 33", and, he does well off road and on the highway with his only modification, a budget boost coil lift kit. I don't remember if he's running 33x10.50 or 33x12.50 BfG's. Your axle gears should be 4.11:1. This should manage 33" tires good enough with out a large outlay of money.

94 YJ, SOA, 2-1/2 Alcans, ARB-front, Detroit-Rear, 4.56:1 gears, Oasis Trailhead compressor, 4:1 Terra Lo, 37x12.50x15 SSR's, 8000 lb Ramsey, & etc.